Hello fellow members of mmowned, i hope this isnt repost, i searched for it and i didnt found anything.
I found nice exploit, you can level up your mining by having quest [Black Blood of Yogg-Saron Sample] witch is obtainable from Agmar's Hammer and going to caves in Azjol-Nerub there is alot of Black Blood of Yogg-Saron Sample veins and they do give mining skill, have by now tested 0-75 and going to test more in next 1hour (75skill in 10-15mins i got).
Remember delete Black Blood of Yogg-Saron Sample items every 10 veins.
If you havent yet done that quest, then you can level mining easy way
EDIT : Getting the skill stopped at 80 so, not so big exploit but still easy for beginner if your allready at lvl70+